670520421 has 24 divisors (see below), whose sum is σ = 1009522176. Its totient is φ = 428375520.

The previous prime is 670520419. The next prime is 670520423. The reversal of 670520421 is 124025076.

It is an interprime number because it is at equal distance from previous prime (670520419) and next prime (670520423).

It is not a de Polignac number, because 670520421 - 2¹ = 670520419 is a prime.

It is a super-3 number, since 3×670520421³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670520423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17071 + ... + 40403.

It is an arithmetic number, because the mean of its divisors is an integer number (42063424).

Almost surely, 2^670520421 is an apocalyptic number.

It is an amenable number.

670520421 is a deficient number, since it is larger than the sum of its proper divisors (339001755).

670520421 is a wasteful number, since it uses less digits than its factorization.

670520421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23473 (or 23470 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 670520421 is about 25894.4090683684. The cubic root of 670520421 is about 875.2605138852.

Adding to 670520421 its reverse (124025076), we get a palindrome (794545497).

The spelling of 670520421 in words is "six hundred seventy million, five hundred twenty thousand, four hundred twenty-one".